Yes Mr Red. Some mums and their children did this around our village back in the summer. They painted little stones with messages or just some art, and left them in various places. But the result was that scores of children flew about like a swarm of bees looking for them.
I found three little girls in my front garden peering earnestly into my shrubs!
I think it's a lovely idea, and the children had a lot of fun with it.
I felt sad for the lady in your video, she had obviously been feeling very low.